Mesophase and magnetic behavior in cobalt(II) and iron(II) compounds |
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| Authors: | Shinya Hayami Yoshihiro Kojima Daisuke Urakami Kazuchika Ohta Katsuya Inoue |
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| Institution: | 1. Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan;2. Smart Materials Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda 386-8567, Japan;3. Institute for Advanced Material Research, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan |
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| Abstract: | The metal complexes with long alkyl chains Co(C16-terpy)3](BF4)2 (1) and Fe(C16-terpy)2](BF4)2 (2) were synthesized and the physical properties of the complex were characterized by magnetic susceptibility, Mössbauer spectroscopy, polarizing optical microscopy, differential scanning calorimetry, and X-ray scattering, where C16-terpy is 4′-hexadecyloxy-2,2′:6′,2′′-terpyridine. Variable-temperature magnetic susceptibility measurements and/or Mössbauer studies revealed that the complex 1 exhibited unique spin transition (T1/2↓ = 217 K and T1/2↑ = 260 K) induced by structural phase transition, and the complex 2 was in the low-spin state in the temperature region of 5–400 K before the first mesophase transition. The cobalt(II) and iron(II) complexes exhibited liquid-crystal properties in the temperature range of 371–528 K and 466–556 K, respectively. After mesophase transition, the complex 1 exhibited only slight spin transition (T1/2↓ = 266 K and T1/2↑ = 279 K), and the complex 2 was in the low-spin state. The compounds with multifunction, i.e., magnetic property and liquid-crystal properties, are important in the development of molecular materials. |
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